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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 687 (TIRE PRESSURE WARNING SYSTEM - DIAGNOSTICS)DATA LIST/ACTIVE TESTTIRE PRESSURE WARNING LAMP CIRCUITINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT COMBINATION METER ASSY (TIRE PRESSURE WARNING LAMP) 
    1. Remove the combination meter assy.
    2. Disconnect combination meter assy C7 and C8 connector.
      Fig 1: Disconnecting Combination Meter Assy C7 & C8 Connector
      G03036153Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check warning lamp on the combination meter assy.
      1. Check that the tire pressure warning lamp comes on the combination meter assy when positive battery voltage is applied to the terminals as shown in WARNING LAMP SPECIFICATION  .
      WARNING LAMP SPECIFICATION

      Warning Lamp Battery Positive Battery Negative
      Tire pressure C7-27 C8-12
    Fig 2: Identifying Tire Pressure Warning Lamp
    G03036154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    Tire pressure warning lamp comes on. 

    1. NG : REPLACE COMBINATION METER ASSY 
    2. OK : Go To Next Step. 
  2. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSY - COMBINATION METER ASSY) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    1. Disconnect the skid control ECU connector.
    2. Measure the resistance according to the value(s) in RESISTANCE SPECIFICATION (W/VSC)  or RESISTANCE SPECIFICATION (W/O VSC)  .
      RESISTANCE SPECIFICATION (W/VSC)

      Tester Connection Specified Condition
      S1-26 (WTIR) - C8-12 Below 1 Ω
      S1-26 (WTIR) - Body ground 10 kΩ or higher
      Fig 3: Identifying Wire Harness Side (W/VSC)
      G03036155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      RESISTANCE SPECIFICATION (W/O VSC)

      Tester Connection Specified Condition
      S2-24 (WTIR) - C8-12 Below 1 Ω
      S2-24 (WTIR) - Body ground 10 kΩ or higher
      Fig 4: Identifying Wire Harness Side (W/O VSC)
      G03036156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.